480 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
extends down as far as Bakersfield.In the Salinas Valley, 
King City is the nearest beet growing point to this region, and is in 
direct line of air drainage between Monterey Bay and the low pass over 
into the interior.” 
According to Ball (1) “curly leaf rarely appears in the region along 
the coast, where fogs are prevalent, but as one passes to the interior 
points it becomes more frequent and seems to be somewhat proportional 
to the temperature encountered .... Except in periods of abundance 
the beet leafhopper is not found in the region along the coast from San 
Francisco south to the Mexican border.” 
III. Favorable Breeding Plants in Cultivated Areas 
In the vSalinas Valley annual saltbushes are scarce and the multiplica¬ 
tion of the pest occurs chiefly on sugar beets. The beet leafhopper has 
been bred from the following plants growing in the cultivated areas of 
the valley: 
Plants in Which Beet Leafhopper Deposited Eggs in Cultivated Areas of 
Salinas Valley. 
Chenopodiaceae. 
Annual Saltbushes. 
1. Silverscale or Fog Weed (A triplex argentea). Native. 
2. Bractscale (Atriplex bracteosa). Native. 
3. Redscale or Red Orache (Atriplex rosea). Introduced from Europe. 
Perennial Saltbushes. 
4. Australian Saltbush (A triplex semibaccata) . Introduced from Australia. 
Pigweeds. 
5. Pigweed or Lamb’s Quarters (Chenopodium album). Common European weed. 
6. Nettle Leaf Goosefoot (Chenopodium murale). Naturalized from Europe. 
Weeds. 
7. Russian Thistle ( Salsola kali tenuifolia). Introduced from Asia. 
Plants From Other Families 
8. Curly Dock ( Rumex crispus). Naturalized from Europe. 
9. Rough Pigweed (Amaranthus retroflexus). Introduced from tropical America. 
10. Tumble Weed (Amaranthus graecizans). Naturalized from tropical America. 
11. Afnaranthus deflexus. Introduced from southern Europe. 
12. Wild Radish (Raphanus sativus). Naturalized from Europe. 
13. Chinese Pusley (Heliotropium curassavicum). Widely distributed in the East 
and in South America and the Old World. 
14. Common Horehound (Marrubium vulgare). Naturalized from Europe. 
15. Tolguacha or Jimson Weed (Datura meteloides). Texas to California and ad¬ 
jacent Mexico. 
16. Black Nightshade (Solanum nigrum douglasii). Native of Europe. 
17. Spiny Clothbur (Xanthium spinosum). Native of Europe? Naturalized from 
Tropical America? Introduced from Chili? 
IV. Spring Dispersal 
During the period 1918-1923, investigations in the Gabilan and Mount 
Diablo ranges conducted by Mr. W. W. Thomas, Mr. E. A. Schwing 
and the writer, have failed to show any evidence, whatsoever, that a 
